/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Reorders the specified graph (function or macro) to be at the new index in the parent (moving whatever was there to be after it), assuming it is reorderable and that is a valid index
static bool MoveGraphBeforeOtherGraph ( [UEdGraph](API\Runtime\Engine\EdGraph\UEdGraph) * Graph, int32 NewIndex, bool bDontRecompile )